Starting Friday, November 26, Scvngr users who check-in at one of the malls will be prompted to complete the new Coke Secret Formula Challenges. Some of the challenges include tasks like having a friend snap a photo of you high-fiving a fellow mall patron (bonus points if your target is drinking a Coke) or snapping a photo of hiding locations throughout the mall (maybe that’s where the Coke Secret Formula is hidden).